How can tartar and plaque be removed from teeth without grinding? is there any paste, etc. for it?
The girders of a suspension bridge form an arc. The definition of an arc is a curve or bowed shape, like a part of a circle. An example of an arc is a rainbow. To arc is defined as to make a curved shape or move in a curved path.
arc. 1  Geometry. any unbroken part of the circumference of a circle or other curved line. 2  Also called electric arc. 3  Astronomy. the part of a circle representing the apparent course of a heavenly body. 4  anything bow-shaped. 5  to form an electric arc. 6  to move in a curve suggestive of an arc.